The , also called were large cruiser submarines (

Junsen type submarine The was a ship class of submarines of the Imperial Japanese Navy (IJN). There were four submarine designs of the Junsen type: J1, a modified J1, J2 and the J3. Class variants The Junsen type submarines were divided into four classes: * * * ...

s) of the Imperial Japanese Navy. Four boats were built between 1926 and 1929. These boats, based on the KD2 and U-139 designs, were of a junsen, or cruiser, type with an impressive range of 24,000 nm. Elderly by 1941 they were among the first Japanese submarines converted to supply duty. * was present during the

attack Attack may refer to: Warfare and combat * Offensive (military) * Charge (warfare) * Attack (fencing) * Strike (attack) * Attack (computing) * Attack aircraft Books and publishing * ''The Attack'' (novel), a book * '' Attack No. 1'', comic an ...

on Pearl Harbor and witnessed the Doolittle raid on Tokyo, before patrolling the Aleutians. Her aft 14 cm gun was then removed to make room for a daihatsu cargo barge and she started shifting supplies in the Solomon Islands. On 29 January 1943, the New Zealand naval trawlers, ''Kiwi'' and ''Moa'' rammed and wrecked her in shallow water at Kamimbo Bay,

Guadalcanal Guadalcanal (; indigenous name: ''Isatabu'') is the principal island in Guadalcanal Province of Solomon Islands, located in the south-western Pacific, northeast of Australia. It is the largest island in the Solomon Islands by area, and the seco ...

. Critical codes remained on board and the Japanese command tried unsuccessfully to destroy the boat with submarine and airplane attacks. The US Navy salvaged 200,000 pages of intelligence: code books, charts, manuals, and the ship's log.Submarine Type J-1
/ref> * was sunk by the destroyer off New Ireland on 7 April 1944. * was ambushed off Guadalcanal by '' PT-59'' and ''PT-44'' on 10 December 1942. * was torpedoed off New Ireland by on 21 December 1942.

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